arch/c6x/include/asm/syscall.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Copyright (C) 2011 Texas Instruments Incorporated
   4  * Author: Mark Salter <[email protected]>
   5  */
   6
   7 #ifndef __ASM_C6X_SYSCALL_H
   8 #define __ASM_C6X_SYSCALL_H
   9
  10 #include <uapi/linux/audit.h>
  11 #include <linux/err.h>
  12 #include <linux/sched.h>
  13
  14 static inline int syscall_get_nr(struct task_struct *task,
  15                                  struct pt_regs *regs)
  16 {
  17         return regs->b0;
  18 }
  19
  20 static inline void syscall_rollback(struct task_struct *task,
  21                                     struct pt_regs *regs)
  22 {
  23         /* do nothing */
  24 }
  25
  26 static inline long syscall_get_error(struct task_struct *task,
  27                                      struct pt_regs *regs)
  28 {
  29         return IS_ERR_VALUE(regs->a4) ? regs->a4 : 0;
  30 }
  31
  32 static inline long syscall_get_return_value(struct task_struct *task,
  33                                             struct pt_regs *regs)
  34 {
  35         return regs->a4;
  36 }
  37
  38 static inline void syscall_set_return_value(struct task_struct *task,
  39                                             struct pt_regs *regs,
  40                                             int error, long val)
  41 {
  42         regs->a4 = error ?: val;
  43 }
  44
  45 static inline void syscall_get_arguments(struct task_struct *task,
  46                                          struct pt_regs *regs,
  47                                          unsigned long *args)
  48 {
  49         *args++ = regs->a4;
  50         *args++ = regs->b4;
  51         *args++ = regs->a6;
  52         *args++ = regs->b6;
  53         *args++ = regs->a8;
  54         *args   = regs->b8;
  55 }
  56
  57 static inline void syscall_set_arguments(struct task_struct *task,
  58                                          struct pt_regs *regs,
  59                                          const unsigned long *args)
  60 {
  61         regs->a4 = *args++;
  62         regs->b4 = *args++;
  63         regs->a6 = *args++;
  64         regs->b6 = *args++;
  65         regs->a8 = *args++;
  66         regs->a9 = *args;
  67 }
  68
  69 static inline int syscall_get_arch(struct task_struct *task)
  70 {
  71         return IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
  72                 ? AUDIT_ARCH_C6XBE : AUDIT_ARCH_C6X;
  73 }
  74
  75 #endif /* __ASM_C6X_SYSCALLS_H */